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The Collaborative International Dictionary
Optimacy

Optimacy \Op"ti*ma*cy\, n. [Cf. F. optimatie. See Optimate.]

  1. Government by the nobility. [R.]
    --Howell.

  2. Collectively, the nobility. [R.]

Wiktionary
optimacy

n. 1 government by the nobility 2 the nobility, collectively 3 a most favourable condition or state